What is Visual Evoked Potential?

Visual evoked potential (VEP) it is a non-invasive test that measures electrical activity in certain areas of the brain in response to sensory input

What does it help to diagnose?

Visual Evoked Potential tests help to identify problems along the visual pathway, that are too subtle to be noticed or found during a regular exam. These problems are usually caused by demyelination, which results in slowed nerve impulses.

Following are the conditions that are diagnosed using the Visual Evoked Potential test

How do I prepare for these tests?

How is this test performed?

The patient is asked to sit in front of a TV monitor while few scalp electrodes are taped over the forehead and the back of the head. The patient is shown a checkerboard pattern and the electrical activity is measured.
Usually the test takes less than 10 minutes, including preparation time.